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. 2011 Jan 26;6(1):e15642. doi: 10.1371/journal.pone.0015642

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Error bars represent the 95% confidence intervals, as calculated from best fit using logarithmic function (see Fig. 2 and 6).